[GitHub] [iotdb] zyk990424 commented on pull request #3918: [IOTDB-1026] Support wildcard ** in Path And Replace PrefixPath usage with PathPattern in IOTDB-SQL

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zyk990424 commented on pull request #3918:
URL: https://github.com/apache/iotdb/pull/3918#issuecomment-921415400


   > Hi, it seems that this change breaks the backward compatibility?
   > 
   > Let's say we have 3 time series: root.sg.d.s1, root.sg.d.s2, and root.sg.d.t.s1.
   > 
   > Before this change, the following query produces a result set that contains all of the time series.
   > 
   > ```
   > select * from root.sg.d
   > ```
   > 
   > After this change, it produces only root.sg.d.s1 and root.sg.d.s2, right?
   
   Yes. It's a big sematic change. 
   In this new feature, you may use the following sql to get all the timeseries.
   ```
   select ** from root.sg.d
   select * from root.sg.d, root.sg.d.**
   ```
   The select clause and from clause will be concat to get the path pattern of timeseries.


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